The working height you can achieve with an extendable jib crane varies from 3 to 30 meters, depending on the type and configuration. Compact models reach 3-8 meters, while heavy industrial versions can reach up to 30 meters. The maximum height is determined by factors such as load capacity, stability and safety standards.
What is an extendable jib crane and how does it work?
An extendable jib crane is a telescopic lifting system that can be adjusted in length by sliding multiple pipe sections into each other. The system works with an inner and outer tube, where hydraulic or mechanical drive ensures the extension of the sections.
The telescopic mechanism consists of various components that work together for optimal functionality. The main beam forms the base, while the extendable sections gradually become narrower towards the end. A drive system, often hydraulic or electric, provides the movement of the sections.
The great advantage over fixed lifting beams is the flexibility in working height. You can adjust the jib crane to different workspaces without having to install multiple systems. This saves space, costs and installation time, especially in environments where different lifting heights are needed.
What factors determine the maximum working height of an extendable jib crane?
The maximum working height is determined by a combination of load capacity, material strength and stability. The greater the extension, the lower the maximum lifting capacity becomes, due to increased deflection and reduced stability of the system.
Material strength plays a crucial role in determining the maximum extension length. The jib crane must withstand the forces created by its own weight, the load and dynamic loads during lifting. Safety standards prescribe minimum safety factors that limit the practical working height.
The relationship between lifting capacity and achievable height is inversely proportional. At maximum extension, the lifting capacity can be up to 50% lower than at fully retracted position. This is due to increased leverage and deflection of the extended part.
What are the standard working heights available on the market?
Standard working heights vary from 3 to 30 meters, divided across different categories. Compact models for light applications reach 3-8 meters, medium-duty versions 8-15 meters and heavy industrial systems 15-30 meters or more.
Compact extendable jib cranes are ideal for workshops, small production facilities and maintenance work. They have a lifting capacity of 0.5-5 tons and offer sufficient flexibility for various tasks without taking up much space.
Medium-duty configurations are often used in production halls, warehouses and assembly areas. These systems combine good working height with substantial lifting capacity of 5-20 tons. Heavy industrial versions are suitable for shipyards, large production facilities and infrastructure projects where extreme heights and lifting capacities are required.
How do you determine what working height you need for your specific application?
First determine the maximum lifting height by measuring the highest position where loads need to be placed, plus a safety margin of at least 0.5-1 meter. Take into account obstacles, ceiling height and the movement space around the load.
Calculate the required working height by adding the following factors: desired lifting height, height of the lifting hook at rest, height of the lifting equipment (chains, slings) and a safety margin. For accurate calculations, you must also account for the deflection of the system under load.
Consider future expansions and changes in your work processes. It is often more economical to choose a slightly longer jib crane than to have to upgrade later. Keep in mind that a longer version affects the lifting capacity and stability of the entire system.
How BKRS helps with extendable jib cranes and working height solutions
BKRS designs and builds custom extendable jib cranes that perfectly match your specific working height requirements. Our experience of more than forty years ensures technical solutions that meet the highest quality and safety standards.
Our services include:
- Technical analysis of your workspace and lifting needs
- Calculation of optimal working height and lifting capacity
- Design of custom telescopic systems
- Complete realization from design to installation
- Annual inspection, maintenance and testing
As a certified inspection company, we offer complete support throughout the entire lifespan of your lifting system. From initial advice to years of maintenance, everything from one contact point for optimal coordination and communication.
Frequently Asked Questions
Can I convert an existing fixed lifting beam to an extendable jib crane?
In most cases this is possible, but requires a technical analysis of the existing construction and support structure. BKRS can assess whether your current installation is suitable for conversion and what modifications are needed for a safe conversion.
How often must an extendable jib crane be inspected?
According to Dutch legislation, jib cranes must be inspected annually by a certified inspection company. In addition, daily visual inspection by the user is mandatory and periodic maintenance must take place.
What happens if I exceed the maximum working height?
Exceeding the maximum working height can lead to dangerous situations such as deflection, instability or even system failure. Modern jib cranes often have built-in limiters to prevent this, but it is essential to always stay within specifications.
Can an extendable jib crane be used for outdoor applications?
Yes, but this requires special protection against weather influences such as corrosion-resistant coatings and sealing of moving parts. Wind load must also be taken into account, which can affect the maximum working height and lifting capacity.